Texas Instruments ADS7891 Handleiding
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SLAS410 − DECEMBER 2003
FEATURES
D3 MHz Sample Rate, 14-Bit Resolution
DZero Latency
DUnipolar, Pseudo Differential Input, Range:
− 0 V to 2.5 V
DHigh Speed Parallel Interface
D78 dB SNR and 88.5 dB THD at 3 MSPS
DPower Dissipation 85 mW at 3 MSPS
DNap Mode (10 mW Power Dissipation)
DPower Down (10 mW)
DInternal Reference
DInternal Reference Buffer
D8-/14-Bit Bus Transfer
D48-Pin TQFP Package
APPLICATIONS
DOptical Networking (DWDM, MEMS Based
Switching)
DSpectrum Analyzers
DHigh Speed Data Acquisition Systems
DHigh Speed Close-Loop Systems
DTelecommunication
DUltra-Sound Detection
DESCRIPTION
The ADS7891 is a 14-bit 3-MSPS A-to-D converter with 2.5-V internal reference. The device includes a
capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit parallel interface
with an additional byte mode that provides easy interface with 8-bit processors. The device has a
pseudo-differential input stage.
The −IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor
and also to cancel common-mode noise. With nap mode enabled, the device operates at lower power when
used at lower conversion rates. The device is available in a 48-pin TQFP package.
_
+
SAR
Output
Latches
and
3-State
Drivers
BYTE
14/8-Bit Parallel
Data Output Bus
Conversion
and
Control Logic
CONVST
BUSY
CS
RD
A_PWDPWD/RST
CDAC
Comparator
CLOCK
2.5 V
Internal
Reference
+IN
−IN
REFIN
REFOUT
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2003, Texas Instruments Incorporated
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS7891 |
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